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A simple record and playback volume control class

, 27 Oct 2001
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A class to make setting the record and playback volume easier
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Sometimes we need to control the volume of our soundcard and Microsoft has provided an API waveOutSetVolume() to do this. Unfortunately this can only set the playback volume. When we want to set the volume of other lines such as mic or MIDI or the line-in for recording, there is NO API to help!

At first I thought that DirectMedia may provide an interface to do this, and it does, but after I coded it and tested, the result is not so good. The interface IAMAudioInputMixer can only handle the record, not the playback, and most of all:

"The name of each pin, such as "Line in" or "Microphone", reflects the type of input"

but the name is not the same on different machines!

I want to set the volume of the microphone, so I find the pin by name "Microphone" and control it, it works on my computer. When I tested it at another machine, it failed because the name of the pin is "Mic Volume"!

I tried many ways and at last I worked out how to do it using MIXER.

There may be some people that have had a headache over the same quetion, so I released my solution. I hope it helps you.


  1. include the Mixer.h and Mixer.cpp into your project;
  2. add code like this:


The constructor takes two parameters, the first is ComponentType from MIXERLINE (see MSDN for all possible values), and the second is an enum type, which can be Record or Play. The above controls the record (waveIn) volume, you can also control the playback (waveout) volume using:


Notice that there is no default constructor takes no parameters, so if you use it in a C++ class, you should code it like this:

// MyClass.h
class CMixer;
class CMyClass
  CMixer m_mixer;


if you have any suggestion or improvement, plz let me know:


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Comments and Discussions

GeneralRe: A poorly documented article Pin
coldembrace30-Jun-04 21:42
susscoldembrace30-Jun-04 21:42 
GeneralRe: A poorly documented article Pin
coldembrace30-Jun-04 21:43
membercoldembrace30-Jun-04 21:43 
GeneralRe: A poorly documented article Pin
Ravi Bhavnani1-Jul-04 4:22
memberRavi Bhavnani1-Jul-04 4:22 
GeneralI cannot control mic &quot;play&quot; volume on XP Pin
Anonymous13-Apr-04 12:38
sussAnonymous13-Apr-04 12:38 
GeneralRe: I cannot control mic &quot;play&quot; volume on XP Pin
Anonymous15-Apr-04 17:49
sussAnonymous15-Apr-04 17:49 
GeneralRe: I cannot control mic &quot;play&quot; volume on XP Pin
Anonymous2-Mar-05 18:50
sussAnonymous2-Mar-05 18:50 
GeneralRecording from Soundcard Pin
Anonymous5-Nov-03 18:59
sussAnonymous5-Nov-03 18:59 
GeneralRe: Recording from Soundcard Pin
Whoo15-Apr-04 18:07
memberWhoo15-Apr-04 18:07 
record from 4 channels simultaneously? that is a questionSmile | :)

suggest u enum every input audio line, and try check the 4 input channels.

if ur soundcard support Simultaneous channels , this may work.
Questionwhat about paning? (n.t.) Pin
DonGuitar30-Sep-03 15:20
memberDonGuitar30-Sep-03 15:20 
Generalgetting slider value Pin
tmf690228-Aug-03 9:12
membertmf690228-Aug-03 9:12 
GeneralRe: getting slider value Pin
Whoo28-Aug-03 20:35
memberWhoo28-Aug-03 20:35 
GeneralRe: getting slider value Pin
tmf29-Aug-03 9:25
susstmf29-Aug-03 9:25 
GeneralRe: getting slider value Pin
Whoo29-Aug-03 19:11
memberWhoo29-Aug-03 19:11 
GeneralRe: getting slider value Pin
SohailB15-Jun-05 22:14
memberSohailB15-Jun-05 22:14 
GeneralRecord Sound Volume Control Pin
Efrain Munoz7-Jul-03 7:45
memberEfrain Munoz7-Jul-03 7:45 
GeneralRe: Record Sound Volume Control Pin
Whoo8-Jul-03 2:15
memberWhoo8-Jul-03 2:15 
GeneralRe: Record Sound Volume Control Pin
Efrain Munoz9-Jul-03 10:35
memberEfrain Munoz9-Jul-03 10:35 
GeneralRe: Record Sound Volume Control Pin
Whoo15-Apr-04 17:58
memberWhoo15-Apr-04 17:58 
GeneralMixer.obj : error LNK2001: unresolved external symbol __imp__mixerGetLineControlsA@12 Pin
tvhead802-Apr-03 3:56
membertvhead802-Apr-03 3:56 
GeneralRe: Add Winmm.lib.:laugh: Pin
tvhead802-Apr-03 4:01
membertvhead802-Apr-03 4:01 
GeneralRe:How to Add Winmm.lib? Pin
severeight1-Apr-04 18:16
membersevereight1-Apr-04 18:16 
GeneralRe:How to Add Winmm.lib? Pin
mmjd11-Apr-04 23:20
membermmjd11-Apr-04 23:20 
GeneralRe:Thank you for your help!! Pin
severeight13-Apr-04 18:22
membersevereight13-Apr-04 18:22 
Generalquesions,thanks Pin
NeverGrief21-Nov-02 7:09
memberNeverGrief21-Nov-02 7:09 
GeneralRe: quesions,thanks Pin
Whoo22-Nov-02 6:33
memberWhoo22-Nov-02 6:33 

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